Original U.S. Military E.C.W.S. (Extreme Cold Weather System) modular sleep system is rated down to -30 degrees, when all pieces are used together. The complete four piece sleep system includes a camouflage waterproof/breathable bivy, black patrol sleeping bag, olive intermediate sleeping bag that all packs in the water resistant nylon compression sack.

NSN: 8465-01-445-6274

Each piece can be used individually or together to create the desired level of warmth. 84x32" tapered with boxed foot that will accommodate boots! The only sleep system you need to own, it is three bags in one, no more need for multiple temperature rated bags that take up storage space. Total weight, 10 pounds, all layers combined.